https://www.classicparts.com/1955-59-V-8-Throttle-Linkage/productinfo/89-651/ (observe how this linkage is mounted to firewall on a 55.2-59 V8 truck and copy it)
https://www.classicparts.com/1953-57-Accelerator-Pedal/productinfo/39-312/

This pedal will also work: https://www.classicparts.com/1958-59-Accelerator-Pedal/productinfo/39-313/

You did not say what parts you still have (pedal, pedal floor bracket,...)

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn